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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab0fb4a61f0d0646af011a057d705b9af5db201b306a774c3ab21e9b45fc36' 
  AND token = '4HbQRvapSGMoEx9Ydu4XZgw0Yai/Jx51Xq2d/tDXB7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}